In section 3.7.1, the graphs showing examples of QAL2 calibrations have been removed. In section 3.7.4, added a requirement on when repeat QAL2 is required for particulate CEMS. In section 3.7.12, the requirement to assess the difference between the average of the SRM and CEMS results has been removed. Added the use of ambient air for O2, when using procedure c. In section 3.7.16, changed virtual ELVs for CO2 and N2O. Changed variability and acceptance test criteria for dust measurements. In section 3.12, the requirements on test gases have been updated. In section 5.3, the reporting requirements for AST failures and repeat QAL2s have changed. Section 7 has been updated to reflect the changes in section 5.3.

Throughout we have updated or deleted references to revised or withdrawn Environment Agency guidance, such as TGN M22. In 3.5.17 we have clarified the calibration of peripheral CEMS measurements. In 6.1 we have added an instruction to obtain approval for the continued use of a previous calibration function. In 6.8 we have added an instruction on applying new calibration functions. In appendix 3 we have added information on quality assurance and quality control procedures for automated dust arrestment plant monitors.

Removed the need to conduct a QAL2 every 3 years for incineration processes.

Incorporates EN14181 MID and Quick Guides 3, 5, 6 and 14. There are also changes to reflect the amendments within EN 14181:2014.

First published.